The boat is a 1992 Hydrodyne. The motors are Mariner 200 HP DFI, or Optimax. I do have a used set of Yamaha controls coming to me. They should work better than the controls currently on the boat, and the cables required probably are in better shape than the cables currently on the boat.
Daniel, My mistake,, I was thinking of a different owner and a different boat. I was 20 years back in time. Good luck with your control upgrades. Kevin